I've been reading "Power Pivot for the Data Analyst". I bought the book because I was having problems linking tables. I recreated the tables in the figure 5.1 in the book. When i create the second link described in the book, power pivot still displays .15 for the BonusRate and gives the error message relationships may be needed. I have had this same problem when attempting to link larger more complex tables. Has anybody else experienced this problem? Do I need to re-install PowerPivot?